Measuring motion through relativistic quantum effects

Ahmadzadegan, Aida; Mann, Robert B.; Martín-Martínez, Eduardo

doi:10.1103/physreva.90.062107

Cited by 11 publications

(10 citation statements)

References 23 publications

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“…This analysis was later extended in various directions, including scalar fields without conformal symmetry, in the static de Sitter coordinate and also quite extensively in the context of quantum entanglement and decoherence, e.g. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] and references therein.…”

Section: Jhep03(2021)220mentioning

confidence: 99%

Unruh-DeWitt detector responses for complex scalar fields in de Sitter spacetime

Ali

Bhattacharya

Lochan

2021

J. High Energ. Phys.

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We derive the response function for a comoving, pointlike Unruh-DeWitt particle detector coupled to a complex scalar field ϕ, in the (3 + 1)-dimensional cosmological de Sitter spacetime. The field-detector coupling is taken to be proportional to ϕ†ϕ. We address both conformally invariant and massless minimally coupled scalar field theories, respectively in the conformal and the Bunch-Davies vacuum. The response function integral for the massless minimal complex scalar, not surprisingly, shows divergences and accordingly we use suitable regularisation scheme to find out well behaved results. The regularised result also contains a de Sitter symmetry breaking logarithm, growing with the cosmological time. Possibility of extension of these results with the so called de Sitter α-vacua is discussed. While we find no apparent problem in computing the response function for a real scalar in these vacua, a complex scalar field is shown to contain some possible ambiguities in the detector response. The case of the minimal and nearly massless scalar field theory is also briefly discussed.

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Section: Jhep03(2021)220mentioning

confidence: 99%

Unruh-DeWitt detector responses for complex scalar fields in de Sitter spacetime

Ali

Bhattacharya

Lochan

2021

J. High Energ. Phys.

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“…Although there are many treatments of quantum optics in a cavity in which the full spatial and temporal mode structures are considered, the number of cases where these approximations are used is vast. For instance, among many, see [1][2][3][4][5][6][7][8] for the single-or few-mode approximation, or, e.g., [9][10][11][12][13] for the usage of 1+1D cavities. While simplifying the problem, sometimes the rationale for these simplifications remains to be justified, above all in relativistic regimes.…”

Section: Introductionmentioning

confidence: 99%

Relativity and quantum optics: accelerated atoms in optical cavities

Lopp¹,

Martín-Martínez²,

Page³

2018

Class. Quantum Grav.

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We analyze the physics of accelerated particle detectors (such as atoms) crossing optical cavities. In particular we focus on the detector response as well as on the energy signature that the detectors imprint in the cavities. In doing so, we examine to what extent the usual approximations made in quantum optics in cavities (such as the single-mode approximation, or the dimensional reduction of 3+1D cavities to simplified 1+1D setups) are acceptable when the atoms move in relativistic trajectories. We also study the dependence of these approximations on the state of the atoms and the relativistic nature of the trajectory. We find that, on very general grounds, and already in the weak coupling limit, single-and few-mode approximations, as well as 1+1D dimensional reductions, yield incorrect results when relativistic scenarios are considered.

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“…It is plausible, therefore, that also the Unruh effect can be significantly modulated by variations in a particle detector's acceleration, i.e., by higher-than-second derivatives in the detector's trajectory. For prior work on the Unruh effect for non-uniform acceleration, see, in particular, [10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

On the Unruh effect, trajectories and information

Ahmadzadegan

Kempf

2018

Class. Quantum Grav.

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We calculate the trajectories which maximize the Unruh effect, mode by mode, when given a fixed energy budget for acceleration. We find that Unruh processes are most likely to occur, and therefore potentially best observable, for certain trajectories whose acceleration is not uniform. In practice, the precise form of optimal trajectories depends on experimental bounds on how fast the acceleration can be changed. We also show that the Unruh spectra of arbitrarily accelerated observers contain the complete information to reconstruct the observers' trajectories.

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Measuring motion through relativistic quantum effects

Cited by 11 publications

References 23 publications

Unruh-DeWitt detector responses for complex scalar fields in de Sitter spacetime

Unruh-DeWitt detector responses for complex scalar fields in de Sitter spacetime

Relativity and quantum optics: accelerated atoms in optical cavities

On the Unruh effect, trajectories and information

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